Question

Which type of tannins is related to the flavonoid pigment having polymeric flavan-3-ol structure?

• A. \( \text{Hydrolysable tannins} \)
• B. \( \text{Condensed tannins} \)
• C. \( \text{Galli tannins} \)
• D. \( \text{Ellagitannins} \)

Hint:

Condensed tannins are non-hydrolysable and yield anthocyanidins upon acid hydrolysis, reflecting their polymeric flavan-3-ol nature. Hydrolysable tannins, on the other hand, are esters of gallic acid or ellagic acid with a core polyol.

Answer 1

The Correct Option is B

Condensed tannins, also known as proanthocyanidins, are oligomeric or polymeric flavonoids composed of flavan-3-ol units. These units, such as catechin and epicatechin, polymerize to form complex structures. Flavonoid pigments, including anthocyanins and flavanols, share a common biosynthetic pathway with these tannins, and condensed tannins are directly related to the polymeric forms of flavan-3-ols.